The Inheritance of Mutant Traits
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The Inheritance of Mutant Traits. Drosophila Culturing. Objective. Determine the pattern of inheritance of mutant traits in Drosophila melanogaster (fruit flies). The pattern of inheritance will either show... incomplete dominance or reveal the dominant and recesssive strains

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The Inheritance of Mutant Traits

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The inheritance of mutant traits

The Inheritance of Mutant Traits

Drosophila Culturing


The inheritance of mutant traits

Objective

Determine the pattern of inheritance of mutant traits

in Drosophila melanogaster (fruit flies)

  • The pattern of inheritance will either show...

    • incomplete dominance or reveal the dominant

    • and recesssive strains

    • sex linkage or autosomal inheritence


The inheritance of mutant traits

Why Fruit Flies?

Takes up little space

Produce numerous

offspring

Many genes to

study & experiment

Easy to Culture

Low rate

of mutations

New generation

every 2 - 3 weeks


The inheritance of mutant traits

adult male

adult female

Drosophila Life Cycle

Egg

Larva

Pupa

Adult


The inheritance of mutant traits

Sex Determination in Drosophila:

Comparing Abdomens

Female

Male

Males

smaller, rounder abdomen

dark posterior

generally smaller

sex combs

Females

large pointed abdomen

light posterior

generally larger

no sex combs

Male Sex Combs

Sex combs

on front legs


The inheritance of mutant traits

Mutant Traits:

Normal:

Apterous

White eyes

Wild type

Vestigial


The inheritance of mutant traits

More Mutant Traits:


The inheritance of mutant traits

Wild

(normal wings)

Vestigial wings

P1 Crosses:

X

Wild

(normal wings)

Wild

(red eyes)

White eyes

Apterous (wingless)

X

X


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